Example analysis of C++ structure usage

This article illustrates the use of C++ constructs. Share with you for your reference. Specific analysis is as follows:

C++ structs provide more functionality than C structs, such as default constructors, copy constructors, and operator overloads, which make it easy for struct objects to pass values.

For example, I define a simple structure and use it as a vector element type. To use it, I need to implement the above three functions, otherwise I have to use Pointers.

#include <iostream>  

#include <vector>  

 using namespace std;  

struct ST  

{  

    int a;  

    int b;  

    ST()  //Default constructor & NBSP; < br / >
    {  

        a = 0;  

        b = 0;  

    }  

      

    void set(ST* s1,ST* s2)//Assignment function & PI; < br / >
    {  

        s1->a = s2->a;  

        s1->b = s2->b;  

    }  

    ST& operator=(const ST& s)//Overloaded operator & NBSP; < br / >
    {  

        set(this,(ST*)&s)  

    }  

    ST(const ST& s)//Copy constructor & NBSP; < br / >
    {  

        *this = s;    

    }  

};  

int main()  

{  

    ST a ;  // call Default constructor & NBSP; < br / >
    vector<ST> v;  

    v.push_back(a);  // call Copy constructor & NBSP; < br / >
    ST s = v.at(0);  //Call = function & NBSP; < br / >
    cout << s.a <<"  " << s.b << endl;  

    cin >> a.a;  

    return 0;  

}

Hope that the article described in the C++ programming to help you.